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Ductal carcinoma in situ Ductal carcinoma in situ (DCIS) is an area of cancer cells that are confined to the milk ducts, where they developed, and have not spread into the surrounding tissue or to any other part of the body. DCIS is often first detected during a routine mammogram, appearing as tiny flecks of calcium, and is not something that can be found by physical breast examination. DCIS is the most common type of non-invasive breast cancer in women and is not harmful at this stage. Approximately 40% of DCIS do become invasive at some stage but this may not be for 15-20 years and there is no way of telling which ones will or will not. It is usual to offer treatment as a precaution. |